I am using a Toshiba laptop from few months, which is running with windows vista OS. I mainly use the machine for internet access and sometimes to time pass by watching videos and play games. I usually play high definition games. I installed vlc and windows default windows media player. The machine was working fine till the last few days, but now there is problem which occurred after I tried to play a .3gp file into vlc player. The sound of my laptop completely vanishes. I not have any technical idea regarding this type of problem. So I am here for getting any solution for this issue. I hope someone will surely help me to overcome from this problem.